Xiaomi Smart Air Purifier 4 Pro has a Particle CADR of up to 500m³/h, and is able to release 8330L of clean air per minute. The purified air is able to reach every corner of your home, so you and your family can breathe healthy all the time and Comprehensive monitoring of air-quality changes for more targeted, efficient purification. In Auto Mode your purifier monitors real-time air quality and automatically adjusts the purification speed.